Comparison of Li EW of HD 61005 (red filled star) with that of Argus association field stars (blue squares) and IC 2391 open cluster stars (black circles) Filled symbols refer to stars with confirmed or likely rotational period in Messina et al. (2010b), and open symbols to stars with uncertain or undetermined rotational period in Messina et al. (2010b). The dashed curve is the cubic fit to the locus of IC 2391 members in the range B − V = 0.50−1.10